Melt 1/2 of your package of vanilla almond bark (about 8 oin the microwave in a very large bowl. Be sure to follow the package instructions for melting. Stir well.
Add 1 tsp pumpkin pie spice to the melted almond bark and mix well.
Then add your entire box of cereal and toss to coat each piece.
Place 1/2 cup powdered sugar in a large zippered bag.
Then add half of your cereal mixture. Zip and shake to coat.
Spread out the cereal onto a cookie sheet.
Repeat with other 1/2 cup powdered sugar and the other half of cereal mixture.
Then allow the coated cereal to set up.
Add cranberries, walnuts, and candy corn to the coated cereal and toss to combine.
Then just add the fall trail mix to a bowl for eating.